Because the black eyeball will not be completely exposed, it will be covered by the upper eyelid margin1~ 3 mm.

The upper eyelid margin covers the black eyeball, which can improve the face value and protect the eyeball.

Everyone exposes different eyeballs, especially those with big eyes and double eyelids, and black eyeballs are exposed more. If the eyes are small, people with single eyelids are relatively less exposed. If you have congenital upper eyelid weakness, your eyes will be less exposed.